Drain fitting operating knob



FIG. 1 is a top, front, left-side perspective view of a drain fitting operating knob showing my new design;

FIG. 2 is a left side-elevational view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a right side-elevational view; and,

FIG. 7 is a rear view thereof. 

The ornamental design for a drain fitting operating knob, as shown and described. 